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Sladkaya [172]
3 years ago
7

What is 50% of 80?

Mathematics
1 answer:
KonstantinChe [14]3 years ago
3 0
50% is 1/2, 1/2 of 80 is 40
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What is the length of stack J M with bar on top space in the rectangular prism? Round your answer to the nearest tenth.
musickatia [10]
Volume of the rectangular prism = l * w * h
Diagonal = √l² + w² + h²
                 = √ 16² + 12² + 8²
                = √464
                 = 21.5  
8 0
3 years ago
Luka invests $8000 at 6% interest for three years
allsm [11]
6/100 x 8000 = 480 x 3 = 1440
1440/800=0.18
0.18 x 100 = 18%
6 0
3 years ago
Which of these is NOT an integer
Tema [17]

Hi there!  

»»————- ★ ————-««

I believe your answer is:  

Option A

»»————- ★ ————-««  

Here’s why:  

⸻⸻⸻⸻

\boxed{\text{Option A:}}\\\\3^{-5}\\\\\rightarrow \frac{1}{3^5}\\\\\rightarrow  \frac{1}{243}\\\\\ \text{This is \textbf{NOT} an integer.}}

⸻⸻⸻⸻

\boxed{\text{Option B:}}\\\\-3^5\\\\\rightarrow -3 * -3 * -3 * -3 * -3 \\\\\rightarrow \boxed{-243}\\\\\\\text{This \textbf{IS} an integer.}

⸻⸻⸻⸻

\boxed{\text{Option C:}}\\\\\frac{1}{3}^{-5} \\\\\rightarrow \frac{1}{(\frac{1}{3})^5}\\\\\rightarrow \frac{1}{\frac{1}{243} }\\\\\rightarrow \boxed{243}\\\\\\\text{This \textbf{IS} an integer.}

⸻⸻⸻⸻

\text{Option \textbf{A} does not simplify into an integer.}

⸻⸻⸻⸻

»»————- ★ ————-««  

Hope this helps you. I apologize if it’s incorrect.  

7 0
3 years ago
Suppose that the distribution is bell-shaped. If approximately 99.7% of the lifetimes lie between 568 hours and 1066 hours, then
irakobra [83]

Answer:

\sigma =\frac{478}{6}=79.667

Step-by-step explanation:

The empirical rule, also referred to as "the three-sigma rule or 68-95-99.7 rule, is a statistical rule which states that for a normal distribution, almost all data falls within three standard deviations (denoted by σ) of the mean (denoted by µ)". The empirical rule shows that 68% falls within the first standard deviation (µ ± σ), 95% within the first two standard deviations (µ ± 2σ), and 99.7% within the first three standard deviations (µ ± 3σ).

And on this case since we are within 3 deviations (because we have 99.7% of the data between 568 and 1066hours), the result obtained using the z score agrees with the empirical rule.  

So on this case we can find the standard deviation on this ways:

\mu -3\sigma = 568     (1)

\mu +3\sigma = 1066   (2)

If we subtract conditions (2) and (1) we got:

1066-588 =\mu +3\sigma -\mu +3\sigma

478= 6\sigma

\sigma =\frac{478}{6}=79.667

3 0
3 years ago
The table below shows function r, which represents the total cost of a field trip to the science museum, in dollars, if n studen
mafiozo [28]

The answer has to be A) r(n) = 15n +55, as when n=0, r(n)=55 so the equation must end with +55.

3 0
4 years ago
Read 2 more answers
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